Bromoform

Harris County Municipal Utility District 155

Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

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Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	ND	4	0	ND
2015	0.280 ppb	5	1	ND - 1.40 ppb
2016	ND	5	0	ND
2017	ND	4	0	ND
2018	ND	5	0	ND
2019	ND	5	0	ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.5 ppb

The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date	Lab ID	Result
2014-03-05	AC45697	ND
2014-04-23	AC51507	ND
2014-07-28	AC61083	ND
2014-12-10	AC74334	ND
2015-03-12	AC84072	1.40 ppb
2015-03-12	AC84139	ND
2015-06-22	AC96784	ND
2015-08-18	AD04527	ND
2015-12-09	AD16214	ND
2016-03-07	AD27219	ND
2016-03-07	AD27302	ND
2016-05-10	AD36064	ND
2016-10-25	AD54603	ND
2016-11-16	AD58299	ND
2017-02-06	AD68718	ND
2017-02-06	AD68763	ND
2017-04-24	AD80677	ND
2017-11-14	AE04736	ND
2018-02-06	AE12490	ND
2018-02-06	AE12510	ND
2018-06-06	AE28850	ND
2018-08-27	AE38523	ND
2018-11-29	AE47391	ND
2019-02-04	AE52674	ND
2019-02-04	AE52704	ND
2019-05-23	AE67952	ND
2019-08-01	AE76797	ND
2019-10-16	AE86756	ND